He said: "Khuram, I know he was inspired by one of the sheikhs who was giving lectures on YouTube, and he belonged to one specific sector of Islam which had very rigid and strict views.

"Videos about fighting non-Muslims for no reasons, innocent non-Muslims.

"He wanted to go to Syria, yes. I heard from (an) uncle that he wanted to go to Syria to fight, but because of the family pressure, or it might be the intervention by the authorities who seized his passport or whatever, he couldn't go there."

The internet was also described as a catalyst in the radicalisation of Butt's co-conspirator Youssef Zaghba, 21, whose mother claimed: "He had the internet and from there he got everything."

Along with Rachid Redouane, 30, the men died in a hail of police gunfire after spending eight minutes laying waste to the nightlife of south London.

All eight people killed in the massacre have been identified. There were three Frenchmen, two Australian women, one Canadian woman, one Spanish man and one British man.